... from 12%, 14%, 16% to 18% above based on their different grades. The product also conta 16% ... from 12%, 14%, 16% to 18% above based on their different grades. The product also contains 3. ... , sulfur, etc, and indeed is a phosphate-based multiple-element fertilizer that is good for improvement of ... spot application, furrow application, coating of fertilizer on the roots of seedlings;(2) Apply granular SSP ...